3D Challenge Coins | High-Relief Metal Medallions Factory

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Custom 3D Challenge Coins

Description :

Dramatic multi-tier 3D sculptural relief. Standard 2D flat coins are mechanically restricted to a 0.4 mm step, but our high-relief 3D tooling delivers 1.5 mm to 3.0 mm of true tactile depth. Marine rigging, full-mast hulls, anatomical contours, and architectural elevations rise naturally from the field with continuous radiused draft angles and zero stepped-stair faceting.
Proof-like cameo contrast and micro-machined texturing. Raised sculptural elements receive selective hand-buffing to an 8K mirror shine, set directly against heavy frosted sandblast or radial stippled background fields. Plated in radiant 24K genuine gold flash, the optical contrast between light-absorbing textured valleys and specular highlights stays sharp under ambient daylight.
Precision reeded rim and archival encapsulation. Perimeter borders are finished with a classic 0.6 mm pitch reeded coin rim to provide secure tactile grip and sovereign coin authenticity. Sealed beneath an oven-cured baked acrylic protective clear coat tested to 48 hours of neutral salt spray (ASTM B117), every piece arrives pre-mounted in snap-fit optical acrylic capsules with 2 years of free die retention on reorders.

Base Metallurgy & Density	Hot-Chamber Die-Cast Zamak 3 (6.6-6.7 g/cm³) or Stamped H65 Brass (8.4-8.5 g/cm³)
Sculptural Relief & Depth	Multi-tier true 3D organic sculpture (1.5-3.0 mm height delta); continuous 360° draft bevels
Standard Diameter & Profile	44 mm, 50 mm, 57 mm (1.75″, 2.00″, 2.25″); thickness 3.5-4.5 mm (0.138″-0.177″)
Surface Contrast Style	Proof-like cameo: 8K mirror polished raised relief with heavy frosted sandblast field
Edge Treatment Standard	Precision reeded / milled serrated edge (0.6 mm pitch); optional CNC diamond cut or laser numbering
Minimum Order Quantity	Evaluation batches from 50-100 pcs; volume price breaks at 300, 500, and 1,000+ units
Production Turnaround	3D proof: 2-4 working hours \| Physical sample: 3-7 working days \| Mass run: 12-18 working days
Tooling Retention Policy	2 years free archive retention (renewed automatically on reorders); $0.00 tooling fee on reorders

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Product Description:

Product Specifications & Custom Craftsmanship Overview

Specification & Benchmark	Gold Valley Direct-Factory Standard
Base Material & Density	Hot-Chamber Die-Cast Zamak 3 (6.6-6.7 g/cm³) or Stamped H65 Brass (8.4-8.5 g/cm³) Explore Custom Challenge Coins Collection
3D Tooling Precision & Tolerances	CNC tool steel die machining precision: ±0.03 mm (±0.0012″); finished coin outer diameter tolerance: ±0.08 mm; thickness tolerance: ±0.10 mm
Standard Dimensions & Weight	Diameter: 44 mm, 50 mm, 57 mm (1.75″, 2.00″, 2.25″); body thickness: 3.5-4.5 mm (0.138″-0.177″); solid weight: 45-75 g per piece
Sculptural Relief & Feature Delta	True 3D multi-level sculpted relief: 1.5-3.0 mm (0.059″-0.118″) maximum height delta; minimum convex detail radius: 0.15 mm
Edge Treatments & Border Serration	Classic reeded / milled edge (0.6 mm pitch); inner beaded rim; CNC diamond cut (rope, wave, cross-cut); 4-axis laser serial numbering
Electroplating & Surface Barrier	Polished 24K real gold flash; dual-tone 24K gold and bright nickel; antique bronze hand-relieved patina; baked acrylic protective clear coat (cured at 150°C, 3H hardness)
Environmental & Corrosion Testing	48-Hour Neutral Salt Spray (NSS) to ASTM B117 with zero blistering or green corrosion; cross-hatch adhesion to ASTM D3359 Grade 5B (0% flaking)
Individual Archival Packaging	Snap-fit optical clear acrylic capsule (Air-Tite style) with zero-rattle precision fit; optional micro acrylic display easel or luxury velvet presentation box
Production & Sampling Timeline	Digital 3D Vector Proof: 2-4 Working Hours \| Physical Pre-Production Sample: 3-7 Working Days \| Mass Production: 12-18 Working Days
Factory Compliance & Audits	ISO 9001:2015 · Sedex SMETA 4-Pillar · Disney FAMA (FAC-086164) · NBCUniversal (L-8360-DT-004) · EN 1811 nickel release · RoHS 2.0

Die-Cast Zamak 3 vs Stamped H65 Brass: Selecting Your Coin Architecture

High-relief 3D challenge coins require distinct manufacturing approaches depending on sculptural depth, contour complexity, and metallic acoustic timbre. We produce both architectures in our Dongguan plant to match mechanical requirements with collector presentation.

• Die-Cast Zamak 3 (Multi-Tier 3D Sculptural Relief)

Best for: Organic sculptural forms, anatomical reliefs, naval vessels with complex rigging, architectural landmarks, and pieces with high relief deltas exceeding 1.5 mm.

Sculptural Freedom & Relief Height: Injected molten Zamak 3 fills intricate tool steel cavities under high pressure at 410°C. This allows dramatic 3D curves, undercuts, and varying thickness profiles up to 3.0 mm depth that mechanical punch stamping cannot form without cracking the die.
Tactile Weight & Detail Resolution: With a solid density of 6.6-6.7 g/cm³, a 44 mm × 3.5 mm piece delivers an authentic, substantial hand feel. Micro-machined background textures like frosted sandblast and tight sailcloth weave replicate crisply across production batches.
Commercial Balance: The most economical tooling method for high-relief multi-level designs. Eliminates multiple hydraulic annealing passes, keeping pilot runs of 100 to 500 pieces cost-effective while preserving sharp relief contours.

• Stamped H65 Brass (Traditional Hydraulic Coining)

Best for: Sovereign bullion tributes, corporate anniversary tokens, and flat planar medallions requiring an 8K mirror field with acoustic ringing sustain.

Sculptural Freedom & Relief Height: Best suited for 2D and 2.5D designs with uniform relief steps under 0.8 mm. High-tonnage hydraulic presses coin solid cold brass blanks, producing razor-sharp lettering and pristine, unblemished flat mirror fields.
Tactile Weight & Detail Resolution: Solid H65 brass achieves a high density of 8.4-8.5 g/cm³, giving the coin a distinctively dense heft and a sustained, high-pitched metallic chime when tapped.
Commercial Balance: Requires hardened tool steel coining dies and high pressing tonnage. Highly suitable for flat proof commemorative editions; review our Custom Commemorative Coins specification for mirrored collector pieces.

💡 Practical Craft Selection Tip: Select die-cast Zamak 3 when your design features organic 3D elevations, curved hull sculptures, or multi-level relief deeper than 1.5 mm. Choose stamped H65 brass when your artwork relies on mirror-flat backgrounds, 2D vector badges, or when a high-density acoustic chime is paramount.

Coin Border & Rim Treatments: Six Precision Mechanical Edge Styles

The perimeter edge establishes how a challenge coin feels in the palm and frames the central relief. We offer precision mechanical and CNC edge milling to complement high-relief 3D centerpieces.

Precision Reeded / Serrated Edge

Classic sovereign coin serration

Uniform vertical grooves machined around the outer rim at a 0.6 mm tooth pitch. Emulates government-issued bullion coinage, delivering clean tactile friction and preventing palm slippage.

Inner Beaded Rim & Step-Edge Frame

Ceremonial and historical medallion borders

A raised outer perimeter encasing a concentric ring of miniature spherical beads. Frames high-relief maritime ships, heraldic emblems, and anniversary dates with classical numismatic elegance.

CNC Diamond-Cut Rope & Wave Edge

Naval and military ceremonial awards

Secondary diamond-tipped cutters shave faceted, light-reflecting scallops directly into the brass or alloy rim. Rotates under light to produce a dynamic, multi-faceted jewelry shimmer.

Cross-Cut / Swirl Diamond Serration

Tactical units and law enforcement crests

Intersecting dual-angle diagonal cuts form a diamond-knurled grip around the outer coin wall. Offers maximum tactile grip while framing heavy central 3D sculptural shields cleanly.

Flat Rim with Rotational Laser Serializing

Limited edition and numbered commemorative sets

The outer cylindrical wall is polished completely flat to receive 4-axis rotational fiber laser engraving. Permanently records individual sequential numbers (e.g., NO. 001/500) around the rim.

Pierced Cutout & Sculptural Contour Border

Custom emblem contours and shield silhouettes

Tooling follows the exterior silhouette of the artwork, with interior open apertures through the body. Creates dramatic negative space and light pass-through while maintaining perimeter wall strength.

Special Electroplated Finishes & Contrast Techniques

Electroplated barrier layers protect raw alloy against atmospheric moisture while setting up the contrast between sculpted relief and background fields.

Process / Effect	Technical Formulation & Appearance	Best Applications
Polished 24K Genuine Gold Flash	Multi-stage copper and bright nickel underplates sealed with a genuine 24K gold electroplated topcoat. Buffed across cotton mops to a mirror gloss that highlights 3D sculptural peaks.	State honors, executive anniversary commemoratives, flagship club medallions
Proof-Like Cameo (8K Mirror & Frosted Fields)	Sculpted 3D relief is polished to an optical 8K mirror shine, while recessed background fields are finished with fine zirconia sandblast. Delivers extreme visual contrast under direct light.	Maritime collector tributes, numismatic replicas, corporate milestones
Two-Tone Selective Gold and Bright Nickel	Masking lacquer is applied to seal specific design areas before alternating between gold and nickel baths. Produces clean two-tone metallic contrast with alignment held within ±0.3 mm.	Dual-service armed forces, joint-venture corporate milestones, complex seals
Deep Antique Bronze & Hand-Relieved Patina	Parts undergo chemical sulfide darkening followed by manual relieving with soft sisal wheels. Crevices retain deep shadow tones while high-relief features reveal warm golden highlights.	Historical military units, veteran honors, tabletop gaming collector sets

For comprehensive plating thickness data, barrier chemistry, and salt spray testing standards, review our Industrial Electroplating & Finishes Standard.

Retail Presentation & Archival Packaging Solutions

Protective packaging prevents environmental oxidation, surface scratches, and fingerprints while establishing a premium unboxing presentation for recipients.

Crystal-Clear OPP Envelope (Included Default)The zero-cost factory baseline. Heavy-gauge archival crystal-clear polypropylene envelope heat-sealed to prevent contact scratches and oxidation during bulk transport.

Snap-Fit Optical Acrylic Capsule (Archival Display Upgrade)High-clarity polystyrene capsule with a precision snap-fit seal. Holds the coin firmly without internal rattling, allowing two-sided viewing without exposing the metal to fingerprint oils.

Micro Acrylic Display Easel Stand (Curated Collector Upgrade)Miniature triangular transparent acrylic display stand engineered to hold heavy 44 mm to 57 mm coins upright on desks, shelves, or collector showcases at an optimal viewing angle.

Hinged Velvet Presentation Box (Executive Gift Presentation)Sturdy metal shell wrapped in plush royal blue, midnight navy, or black velvet with white silk satin lid lining and custom die-cut EVA recess molded to the encapsulated coin.

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From Concept to Creation: Direct-Factory Production & Quality Assurance

1. 3D Digital Sculpting & Tool Steel Machining	Customer 2D artwork is converted into multi-plane 3D digital topologies. Hardened Cr12MoV tool steel dies are machined via high-speed CNC milling and precision sinker EDM, followed by manual bench polishing under stereo magnification to ensure smooth draft angles.
2. High-Pressure Hot-Chamber Die Casting	Zamak 3 zinc alloy is melted at 410°C and injected under high pressure into preheated steel dies. Rapid hydraulic clamping forces molten alloy into microscopic cavity recesses, capturing fine rigging, lettering, and multi-tier sculptural contours with zero porosity.
3. Precision Rim Machining & Reeded Serration	After gate trimming and vibratory deburring, raw coin blanks transfer to secondary rotary lathes. Outer edges receive precision reeding at 0.6 mm pitch or diamond-faceted cuts before electroplating to maintain sharp, burr-free serrations.
4. Multi-Layer Electroplating & Hand Buffing	Raw castings pass through ultrasonic degreasing, copper strike, acid leveling copper, and bright nickel barrier layers (≥ 8-10 μm). Finished surfaces receive 24K real gold flash or antique patina, followed by hand-buffing across raised sculptural peaks.
5. Baked Acrylic Protective Clear Coating	To preserve mirror gold finishes against skin oils and environmental moisture, coins receive an automated dip-spin application of baked acrylic protective clear coat, cured in continuous infrared ovens at 150°C to achieve a 3H pencil hardness barrier.
6. 100% Optical Inspection & Capsule Packaging	Every single challenge coin is examined by hand under 1000-lux daylight inspection lamps for plating voids, relief flaws, or edge burrs. Qualified pieces are fitted into optical acrylic capsules by operators wearing lint-free antistatic gloves.

Factory Assurance: Manufacturing tolerances, metallurgical purity, and plating barrier integrity are certified by the Director of Quality & Engineering at our Dongguan manufacturing facility. The 3,000 m² facility operates under ISO 9001:2015 quality certification, Sedex SMETA 4-Pillar compliance, and authorized Disney FAMA (FAC-086164) and NBCUniversal (L-8360-DT-004) manufacturing standards.

[RFQ] Sourcing Spec Sheet (Copy-Paste for Your RFQ)

Paste the baseline below straight into your request for quotation, or contact our engineering team for an itemized factory quotation within 2 to 4 working hours:

• Base Metallurgy: Hot-chamber die-cast Zamak 3 (density 6.6-6.7 g/cm³) or stamped H65 brass (8.4-8.5 g/cm³)

• Dimensional Range: Standard diameter 44 mm, 50 mm, 57 mm (1.75″, 2.00″, 2.25″); body thickness 3.5-4.5 mm (0.138″-0.177″)

• 3D Relief Depth: True 3D multi-level sculpted relief with 1.5-3.0 mm (0.059″-0.118″) height delta and continuous draft angles

• Tooling Tolerances: CNC tool steel die cavity: ±0.03 mm (±0.0012″); finished coin outer diameter: ±0.08 mm; thickness: ±0.10 mm

• Edge Treatment: Precision reeded serrated coin rim (0.6 mm pitch), inner beaded border, CNC diamond cut, or laser serializing

• Plating & Coating: Multi-layer barrier plating with polished 24K real gold flash; oven-cured baked acrylic protective clear coat

• Quality Benchmark: 48-Hour ASTM B117 Neutral Salt Spray (NSS) passed; ASTM D3359 Grade 5B adhesion; AQL 1.5 Major / 4.0 Mino

(Engineered to Gold Valley Factory Tolerances — Dongguan Facility)

Custom 3D Challenge Coins: Ordering & Production FAQ

What is the main structural difference between 3D challenge coins and traditional 2D coins?

A: Traditional 2D challenge coins are created with flat stepped planes: artwork sits at either a raised level or a recessed level with vertical 90-degree sidewalls (typically limited to a 0.4 mm step). In contrast, custom 3D challenge coins feature multi-plane sculpted reliefs with smooth, organic curvatures, anatomical depth, and varying thickness profiles up to 1.5 mm to 3.0 mm. This creates tactile realism for naval vessels, portraits, heraldic shields, and architectural landmarks that flat 2D dies cannot reproduce.

What is the minimum order quantity for custom 3D challenge coins?

A: Our pilot evaluation batch begins at 50 to 100 pieces (with one-time custom steel tooling). Production economics improve significantly at volume breaks of 300, 500, and 1,000+ units, where initial mold costs are fully amortized across the run. Multiple plated finishes (such as polished 24K gold and antique bronze) using the same die tooling can be combined within a single order batch.

How do you achieve the high-contrast proof-like cameo finish?

A: The proof-like cameo effect is achieved through coordinated tooling and finishing techniques. During mold fabrication, background fields are micro-textured using fine sandblasting or precision EDM texturing, while the high-relief cavities are hand-stoned to a mirror finish. After die casting and electroplating in genuine 24K gold flash, the raised sculptural peaks are hand-buffed on cotton wheels. The resulting optical contrast between diffuse background texturing and mirror-polished highlights gives each coin museum-grade visual clarity.

Can our team review 3D proof renders before mold machining begins?

A: Yes. Every custom project begins with a comprehensive 3D vector and topographic rendering prepared by our CAD engineering department. We evaluate draft angles, feature clearances, and relief elevations, delivering a full-color proof within 2 to 4 working hours. You can submit your vector or 3D files to our engineering team to review mold feasibility with zero obligation.

How long are production dies retained for future reorders?

A: We store all custom CNC-machined tool steel dies in our climate-controlled tooling archive for a standard period of 2 years free die retention on reorders (renewed automatically on each production run). As long as you reorder within this timeframe, your order incurs a $0.00 tooling charge.

What ethical audits and environmental certifications verify your manufacturing?

A: Gold Valley operates an audited 3,000 m² direct-manufacturing facility in Dongguan certified to ISO 9001:2015 quality management and audited under Sedex SMETA 4-Pillar ethical guidelines. We hold official Disney FAMA authorization (FAC-086164) and NBCUniversal compliance approval (L-8360-DT-004) for licensed metal manufacturing. All electroplating finishes comply with European EN 1811 nickel release restrictions and RoHS 2.0 heavy metal directives.